The Oršić family (Orssich) is an old Croatian noble family, thought, by oral tradition, to have descended from the Croatian noble clan of Lapčan and Karinjan, remarkable in the Kingdom of Croatia in personal union with Hungary and within the Habsburg Monarchy respectively, whose notable members were politicians, senior military officers, župans or other state officials, as well as cultural workers and patrons.

In the middle of the 15th century (between 1464 and 1472), the Oršićs moved to the northwest, due to the fall of the Kingdom of Bosnia and increasing danger of Ottoman Turks' territorial advancement.

In 1487, king Matija Korvin granted them Slavetić estate, northwest of Jastrebarsko, and since then they carried the name Orssichs of Slavetich (Croatian: Oršići Slavetićki).

FML) of the Habsburg monarchy imperial army, grand župan of the Zagreb County and the assessor of the Tabula Banalis, Ban's (viceroy's) Supreme Court, was given the hereditary title of Count, for his military merits.

From Ivan Nepomuk Oršić (1752–1792), Adam's younger brother, originate all further members of the family, whose descendants live today in many countries all over the world.